HARRISBURG — Democrats Wednesday attacked a newly unveiled $27.7 billion state spending plan written by majority Republicans, calling it a gift to big business that will lock in this year’s deep cuts in aid to public schools while forcing longer waits for people who need services such as treatment for mental illness or addiction.

The legislation, made public just four days before the new fiscal year begins, passed the House Appropriations Committee on a party-line vote Wednesday morning after two hours of debate. The House adjourned Wednesday without action on the bill, and floor debate was expected to begin this morning. The plan will need Senate approval after that.

Democrats were getting their first look at the document after having been excluded from private negotiations between Republican Gov. Tom Corbett and his fellow Republicans who control both chambers of the state Legislature.

“I think this budget represents a woefully misplaced priority,” Rep. Matthew Bradford, D-Montgomery, said during the committee meeting.

With lawmakers hoping to wrap up work for the summer on Friday, Republicans still had a lot to do.

They met privately for long periods Wednesday over various last-minute efforts to insert pet provisions into budget-related legislation. Among those was a Corbett administration attempt to win House support to absorb seven different pots of aid for county-administered services — for the homeless, mentally ill and disabled, neglected or abused children and drug and alcohol addicts — into one block grant program.

“I would say that we have a reasonable amount of work to do,” House Speaker Sam Smith, R-Jefferson, said.

Many nonprofit groups that carry out much of the state’s safety-net services oppose it for fear mandated services, such as child-abuse investigations, will drain much of the money.

House Republicans sought to change the way gambling-financed grants for public construction projects are distributed, while Senate Appropriations Committee Chairman Jake Corman, R-Centre, pressed for a provision to remove the state income tax deduction that Pennsylvania allows on contributions toward 529 college-savings plans operated by other states.

Meanwhile, final legislation remained under wraps Wednesday for Corbett’s top priority: a $1.7 billion tax break that he wants in an effort to lure a new petrochemical industry to Pennsylvania.

The plan for the 2012-13 fiscal year that begins Sunday would increase spending by about 1.5 percent, largely for debt, pensions, health care for the poor and to help fill a shortfall in the almost-finished fiscal year.