Mexico City - Mexico wants China to loosen up and have a little tequila. Actually, lots of it.

Since China President Xi Jinping and Mexico's Enrique Pena Nieto broke a diplomatic and economic chill and agreed to boost trade, tequila producers have been gearing up to make the world's most populous country their second-biggest market, after the margarita-loving United States.

The drink synonymous with Mexico is available in more than 100 countries. But export of the alcoholic beverage to China has been limited by legal and sanitary restrictions.

Chinese authorities changed their rules last week, deciding that the purest and best tequila, known as blue agave, has no detrimental health effects. That has opened the door for businesses in both countries to begin promoting and exploring ways to sell more tequila.

With the purchasing power of 1.3 billion Chinese, tequila producers see a niche market, especially among the emerging upper class.

"The potential of this industry is that in five years, we can reach 10 million liters in exports," said Ramon Gonzalez, director of Mexico's tequila promotion council. "Today's new rich are in China."

Until the change by health authorities last week, the Chinese couldn't drink the good stuff made famous by swilling cowboys in many a western on the big screen.

Because of restrictions on methanol per liter of alcohol, China had only allowed the import of lower quality tequila made with 51 percent agave sugar, the rest of the sugar a mix from other plants. The methanol content in blue agave tequila was considered too high.

Mexico exports a total of 43.7 millions of gallons (165.7 million liters) of tequila, with 80 percent of the bottles going to the United States. Little more than 108,000 gallons (410,250 liters) go to China. Mexico in the past wasn't that interested in exporting its lower-quality tequila, said Mexican Agriculture Secretary Enrique Martinez, who announced the change by Chinese health authorities on Tuesday.

"I'm convinced that we're going to be very successful," said Martinez, who led a trade delegation to China last week to help speed export of $1 billion dollars in Mexican goods over the next year. "It's a Mexican product that will conquer the preferences of Chinese consumers."

Former President of Mexico Felipe Calderon indicated in 2010 that the Chinese were willing to lift their restrictions and allow import of 100 percent blue agave tequila. But when Calderon left office last year, that still had not happened and relations had cooled after his meeting with exiled Tibetan spiritual leader the Dalai Lama.

During Xi's visit to Mexico earlier this month, the countries agreed to try to level their trade imbalance, which favors China 10 to 1.

The two presidents - and especially the first ladies - hit it off, spending the better part of three days together and visiting the Maya ruins of Chichen Itza. They made tequila and pork priorities for increasing Mexican exports to China.